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In this paper, in considering the influence of interaction and material decomposition, the generation of NOx inside the rotary kiln and precalciner, which are the main NOx emission equipments in cement production process, are simulated by CFD technology, and the results is tally with the actual situation.
Numerical simulation of NOx formation in rotary kiln.
Numerical simulation of NOx formation in precalciner.
But these question can be easily solved by using numerical simulation.
By using CFD technology, complete the numerical simulation of NOx formation in rotary kiln, and prove that the generation of NOx in rotary kiln is mainly thermal NOx; 2).

Recently a few papers mentioned the numerical simulations based CFD to study the aerodynamic characteristic of the two vehicles crossing each other.
Recent some numerical simulations were carried out.
One commercial CFD software--STAR-CD provides with the functions.The domain and boundary setting are showed in Fig.1.
At first the single car and coach are simulations by CFD separatedly.
Comparing with the all the vehicle model results from CFD and test, little difference is found.

The numerical simulations of the ORC turbine were carried out by using the CFD program.
As shown in the Table 3, the mass rate and total pressure ratio are very closely between design and numerical simulation results.
The simulation isentropic efficiency is higher than the design goal.
The main reason for this situation is neglected the tip clearance and numerical simulation also has somewhat effects.
Table 3 Overall performances of the turbine Mass flow[kg/s] Design 4.85 CFD simulation 4.91 Isentropic efficiency Design 86.63% CFD simulation 90.08% Power [kW] Design 308.15 CFD simulation 330.45 (a) (b) (a) (b) Fig.5 The distribution of static pressure on the stator (a)and rotor(b) blade surface at midspan Fig.6 The calculated limiting streamline patterns near the suction surface(a) and pressure surface(b) of the rotor Fig.5(a) shows the distributions of static pressure on the stator blade surface at 50% blade height.

The simulation showed a complex 3D flow pattern around the buildings.
This can be investigated by either physical models using a wind tunnel or numerical models using computational fluid dynamics (CFD) methods.
In addition, CFD simulations can provide detailed information of the wind flow field around the buildings under various conditions [6].
The CFD simulations can help to better plan urban areas by improving the wind environment around buildings via natural air ventilation.
This was confirmed by comparing the current simulations with the simulations of a prior study with buildings of the same height.

This study presents optimal design of wind booster, by utilizing Computational Fluid Dynamics (CFD).
In CFD-based experiments, guiding and throttling effects of the wind booster are able to increase mechanical power of a VAWT.
In this work, a wind booster is proposed for CFD-based analysis and optimization in order to improve angular speed of the VAWTs.
Results and discussion The experiments of VAWT rotations are performed with CFD-based simulations by utilizing XFlowTM CFD software [5].
In simulations, the wind speed is varied from 1 m/s to 8 m/s for low wind speed conditions.

The aim of the present investigation is to illustrate an innovative methodology based on numerical method to optimize combustion chamber geometry for retrofitting a dedicated mono-gas simulation engine using CFD package powered by Ansys workbench.
In the simulation, the working fluids are combination of air.
The TKE during suction stroke can be found out from the simulations to verify the generation of air-fuel structure inside the cylinder, as Fig 2.
The validation works through the experimental test will be carried out soon, as a proof that the performed CFD simulation has been correct and accurate.
[13] Varol, Y., et al., CFD modeling of heat transfer and fluid flow inside a pent-roof type combustion chamber using dynamic model.

Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of fluidic gyroscope, meshing, loads applying and equation solving.
Fig. 3 Two-dimensional simplified models of sensitive cavity Solve with Finite Element Method The FLOTRAN CFD analysis of ANSYS software is an advanced tools used to study two dimensional and three dimensional flow fields, the simulation typically comprises modeling, loading and solving [3-4].
Select FLOTRAN CFD analysis of ANSYS software.
Conclusions ANSYS-FLOTRAN CFD software is used to calculate two-dimensional flow field distribution of different thermal wires spacing in fluidic gyroscope sensitive element.
Wang: Numerical simulation of practical engineering in ANSYS (Northwestern Polytechnical University Press, China 1999)

Meanwhile, the finite model of the valveless micropump is built by using the ANSYS/FLOTRAN CFD finite element software, and coupled-field simulation analysis is carried out.
Finite Element Simulation It is an effective way to design micropump with the finite element simulation.
We have used ANSYS/FLOTRAN CFD software for the simulation of the fluid in micropump, including two-dimensional and three-dimensional simulation.
A fluid element, FLUID142, is used in three-dimensional simulation, while FLUID 141 in two-dimensional simulation.
Fig.9 The pressure contour of micro pump Fig.10 The pressure distribution of diffusion/shrinkage tube Conclusion Based on the flow property of diffusion and shrinkage elements, the theory analysis is developed for a valveless micropump, and the finite model of the valveless micropump is built by using the ANSYS/FLOTRAN CFD finite element software, and coupled-field simulation analysis is carried out.

A Study on Hovercraft Resistance Using Numerical Modeling Phan Anh Tuan Full Hanoi University of Science and Technology No.1 Daicoviet road, Hanoi, Vietnam Email: tuan.phananh@hust.edu.vn Keywords: Hovercraft resistance, Minimizing fuel consumption, CFD.
This paper presents a method for calculating hovercraft resistance using computational fluid dynamics (CFD) tools.
This paper presents a method for calculating hovercraft resistance using computational fluid dynamics (CFD) tools.
Computational domain for CFD simulation in this study is showing in Fig.3.
Figure 2 3D model of hovercraft Figure 3 Domain for CFD Result and Discussion Velocity and pressure distribution.

Hanjalic et al. developed a CFD technique to simulate the near-wall eddy current.
As previously mentioned, CFD is an interesting and useful tool in designing of a intake manifold.
Most of manifold designs by utilizing CFD techniques were widely done by just considering only steady flow.
Beside the manifold wall of the air flow path, the boundary conditions of the flow inlet and six outlet surfaces as shown in Fig. 1 were identified by the simulation results from a cycle simulation program, “AVL Boost”.
Transient CFD techniques will be crucial to future improvement of intake manifold design.